All‐Carbon Nanotube‐Based Flexible Field‐Emission Devices: From Cathode to Anode

Abstract

The fabrication of a flexible field‐emission device (FED) using single‐walled carbon nanotube (SWNT) network films as the conducting electrodes (anode and cathode) and thin multi‐walled CNT/TEOS hybrid films as the emitters is reported. P‐type doping with gold ions and passivation with tetraethylorthosilicate (TEOS) made the SWNT network film highly conductive and environmentally stable, and hence a good alternative to conventional indium tin oxide electrodes. CNT/TEOS hybrid emitters showed high current density, low turn‐on field, and long‐term emission stability, compared with CNT emitters; these characteristics can be attributed to the TEOS sol, acting both as a protective layer surrounding the nanotube tip, and as an adhesive layer enhancing the nanotube adhesion to the substrate. All‐CNT‐based flexible FEDs fabricated by this approach showed high flexibility in field emission characteristics and extremely bright electron emission patterns.

Enhanced Field-Emission Performance from Carbon Nanotube Emitters on Nickel Foam Cathodes

“…[1][2][3][4][5][6][7][8] One of the most promising applications of CNTs is in field-emission devices, [9][10][11][12][13][14] which is enabled by their extremely high aspect ratio, tremendous mechanical strength, and remarkable electrical and thermal conductivities. 15,16 Efforts have been made to improve scalable CNT-based field-emission devices, but many structural aspects that play significant roles in such devices have yet to be explored, e.g., a more suitable substrate to support CNT emitters.…”

RETRACTED ARTICLE: Flexible Field Emitter for X-ray Generation by Implanting CNTs into Nickel Foil

“…Most studies have attempted to fabricate CNT emitters on polymeric substrates for flexibility purposes by using electrophoretic method [6], direct growth [7], transfer [8, 9], and wet coating [5]. Those methods have many merits in preparing CNT emitters such as simple processes and controllable loading of CNTs.…”

Water-processed carbon nanotube/graphene hybrids with enhanced field emission properties

“…CNTs are an ideal cold cathode for field emission, 11,12 but the poor inter-tube contacts and large bundles make them less efficient for electron conduction. 13 On the other hand, although graphene is a semi-metal, its only emitting sources are defects and edges, and their electron yields are relatively low.…”